HN440 USER’S GUIDE
2 6 I n s t a l l a t i o n
Internal connectors
The precise sequence in which you make internal connections
depends on the physical layout of the chassis and the position
of the motherboard within it, as these determine the
accessibility of the various motherboard connectors.
After all internal connections have been made, close the
chassis.
Ribbon signal cables plug into their respective motherboard
connectors in only one orientation, to prevent incorrect
insertion. Also, the cables themselves are usually marked with
a red stripe corresponding to pin 1 of the connector. Press
firmly, but if the ribbon cable plug does not seem to fit it is
probably the wrong way round.
Diskette drive connector (item 2 on page 10). Intended for
the diskette (floppy) drive ribbon signal cable.
Primary/Secondary IDE connectors (items 4 and 5 on page
10). Typically, the primary connector is used for the system’s
hard disk drives and the secondary or removable-media drives
such as CD-ROM or tape.
Each connector can support two Enhanced IDE or ATAPI
devices: one Master and one Slave. Refer to your drive’s
documentation or packaging to find out how to configure it as
Master or Slave (typically by repositioning jumpers on the
drive). IDE ribbon cables should not be longer than 45 cm.
Processor and chassis fan connectors (items 20 and 21 on
page 10). These are designed for fans with 3-pin plugs.
Typically, the red or coloured wire is the +12 V line, the
white wire is ground.
The processor fan is normally always on but will stop
automatically when the system is in a power-saving Suspend
mode.
The chassis fan speed may be thermally controlled (according
to the processor’s temperature) if the system has a 100 MHz-
bus processor and a Heceta II System Monitor device fitted,
and if you are using an ACPI-aware operating system. This
can reduce fan noise in normal operation.